Return-Path: Received: from mtain-mi06.r1000.mx.aol.com (mtain-mi06.r1000.mail.aol.com [172.21.131.164]) by air-db03.mail.aol.com (v129.4) with ESMTP id MAILINDB031-85ef4ceaa9442f3; Mon, 22 Nov 2010 12:32:52 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mi06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 1097B380000EE; Mon, 22 Nov 2010 12:32:48 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PKaEn-00019B-Vi for rs_out_1@blacksheep.org; Mon, 22 Nov 2010 17:31:33 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PKaEn-000191-Du for rsgb_lf_group@blacksheep.org; Mon, 22 Nov 2010 17:31:33 +0000 Received: from mail-bw0-f43.google.com ([209.85.214.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PKaEk-0005qy-57 for rsgb_lf_group@blacksheep.org; Mon, 22 Nov 2010 17:31:33 +0000 Received: by bwz14 with SMTP id 14so6374512bwz.16 for ; Mon, 22 Nov 2010 09:31:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=o4IJGlOQT4NZe43Ja18cAKeBFvKk8UOyfA/KRTSU+sk=; b=o4pyxFlkYNYLAK3PEboxyjZPNMxrepLKqVvpZjrq0CD2Xg7vfaKNpKJe6pnFVRU31F nFUxJ+RED5iGnDoBNvYyho+1iF+/dtRq389AV4eQaz06FaNlYvGCES+l9EHvDncNKVbd 6CAI0caUxDVWusAS7nlcus9LkEGnwPDFmrMzE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=ACjy62MOH3Mm2UaFABEm9im+uc6hb7jc5v86WmdI0zWQbHj3KhOBcUcMdzME018Myy z3vptlF8yL3bTPaWVprm0GM9os4nrsBcPdHZzQX58j6bLR6qcPZ8wVoqqN1PETYKRaI5 fYRUEJZzhkSWpza1k4PKqaWowHiDiK8tnAVt4= MIME-Version: 1.0 Received: by 10.204.69.210 with SMTP id a18mr5572745bkj.130.1290447083136; Mon, 22 Nov 2010 09:31:23 -0800 (PST) Received: by 10.204.48.215 with HTTP; Mon, 22 Nov 2010 09:31:21 -0800 (PST) In-Reply-To: <256616.36903.qm@web28502.mail.ukl.yahoo.com> References: <861077.53684.qm@web28512.mail.ukl.yahoo.com> <863803.39905.qm@web28510.mail.ukl.yahoo.com> <000901cb8a60$07eb0f50$0301a8c0@your91hoehfy9g> <256616.36903.qm@web28502.mail.ukl.yahoo.com> Date: Mon, 22 Nov 2010 17:31:21 +0000 Message-ID: From: Roger Lapthorn To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: Re: VLF Transmissions Content-Type: multipart/alternative; boundary=0016368e33edfeafa70495a79fea X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_40_50,HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m286.1 ; domain : gmail.com DKIM : pass x-aol-sid: 3039400cdece4ceaa9402af3 X-AOL-IP: 195.171.43.25 X-Mailer: Unknown (No Version) --0016368e33edfeafa70495a79fea Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Chris, My VLF grabber is running and will be on this evening connected to my loop aiming in your direction. See https://dl.dropbox.com/u/15047843/xbm_grab.jpg. I am also capturing in Spectran locally every few minutes and will let you have any screen shots. Good luck! 73s Roger G3XBM On 22 November 2010 17:12, Chris Osborn wrote: > Hello Mal, > > I've wound an air-cored loading coil of about 1.3 H > It's on a wooden frame with hexagonal ends (all yacht varnished) and has= a > mean diameter of 2 feet. > The winding length is 20 inches and it resonates my 40m inverted 'L' at= the > correct frequency of 8.97 kHz > > I've made a VLF exciter which generates the drive frequency and interfac= es > with the PC's software. > It uses a 2297 kHz crystal divided by 256 and gives a square wave output > for the PA FET's. > I can run CW, QRSS or DFCW with 0.05 Hz shift. > > For the TX I've modified my existing 200 watt 500 kHz PA and for matchin= g > use an ex-UPS transformer. > The PA seems quite efficient into a 2000 - 3000 ohm resistive load. > > I have yet to be picked up beyond the boundary of my own garden so would= be > over the moon if anyone else can detect my signals. > > 73 Chris > G3XIZ > > > > > ------------------------------ > *From:* mal hamilton > *To:* rsgb_lf_group@blacksheep.org > *Sent:* Mon, 22 November, 2010 16:12:15 > *Subject:* LF: Re: VLF Transmissions > > =EF=BB=BF > Chris > What are u using for a loading coil, amp etc > mal/g3kev > > > ----- Original Message ----- > *From:* Chris Osborn > *To:* LF Group > *Sent:* Monday, November 22, 2010 3:13 PM > *Subject:* LF: VLF Transmissions > > LF, > > I have permission to transmit VLF this evening and details are as follow= s:- > > > ------------------------------ > ** > > > DETAILS OF TESTS > > Loc: Biggleswade IO 92 UB > Time: Monday 22nd November 2010 20.00 - 22.00 GMT > Freq: 8.9719 kHz > Mode: QRSS - 10 second dot length / DFCW with 0.05 Hz shift / CW > identifier at 5 wpm > Power: Limited to 20 watts RF output (ERP unknown) > Aer: 40m inverted 'L' at 10 m above ground. > > > Any reports or comments are welcome.I > > Regards, > > Chris > G3XIZ > > > > > > --=20 http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 --0016368e33edfeafa70495a79fea Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Chris,

My VLF grabber is running and will be on this evening connec= ted to my loop aiming in your direction. See https://dl.dropbox.com/u/15047843/xbm_grab.j= pg . I am also capturing in Spectran locally every few minutes and wil= l let you have any screen shots.

Good luck!

73s
Roger G3XBM

On 22 November 2010 17:12, Chris Osborn <g3xiz@yahoo.co.uk> wrote:
Hello Mal,

I've wound an air-cored loading coil of about 1.= 3 H
It's on a wooden frame with hexagonal ends (all yacht varnished= ) and has a mean diameter of 2 feet.
The winding length is 20 inches and it resonates my 40m inverted 'L= 9; at the correct frequency of 8.97 kHz

I've made a VLF exciter= which generates the drive frequency and interfaces with the PC's soft= ware.
It uses a 2297 kHz crystal divided by 256 and gives a square wave output= for the PA FET's.
I can run CW, QRSS or DFCW with 0.05 Hz shift.
For the TX I've modified my existing 200 watt 500 kHz PA and for= matching use an ex-UPS transformer.
The PA seems quite efficient into a 2000 - 3000 ohm resistive load.
I have yet to be picked up beyond the boundary of my own garden so would= be over the moon if anyone else can detect my signals.

73 Chris
G3XIZ



From: mal hamilton <g3kevmal@talktalk.net>
To: rsgb_lf_group@blacksheep.org
Sent: Mon, 22 November,= 2010 16:12:15
Subject: LF: Re: VLF Transmissions

=EF=BB=BF =20
Chris
What are u using for a loading coil,= amp=20 etc
mal/g3kev
=C2=A0
----- Original Message -----
From:=20 Chris Osborn=20
Sent: Monday, November 22, 2010= 3:13=20 PM
Subject: LF: VLF Transmissions

LF,

I have= permission to transmit VLF this evening and details=20 are as follows:-



=C2=A0
DETAILS OF=C2=A0TESTS
=C2=A0
Loc:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=20 Biggleswade=C2=A0=C2=A0 IO 92 UB=C2=A0=20
Time:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Monday 22nd=C2=A0Nov= ember=20 2010=C2=A0=C2=A0=C2=A020.00 - 22.00=C2=A0GMT
Freq:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 8.9719 kHz
Mode:=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0QRSS - 10 second dot length /= DFCW=20 with 0.05 Hz shift / CW identifier at=C2=A05 wpm
Power:=C2=A0=C2=A0=C2=A0 =C2=A0Limited to 20 watts=C2=A0RF output= (ERP=20 unknown)
Aer:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 40m inverted= 'L' at=20 10 m above ground.


Any reports or comments are welcome.I
Regards,
=C2=A0
Chris
G3XIZ








--
http://g3xbm-qrp.blogsp= ot.com/
http:/= /www.g3xbm.co.uk
http://www= .youtube.com/user/g3xbm
G3XBM=C2=A0=C2=A0 GQRP 1678=C2=A0=C2=A0=C2= =A0 ISWL G11088
--0016368e33edfeafa70495a79fea--